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Old 10-11-2016, 01:38 PM   #15
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Location: Monument, CO
Posts: 134
Originally Posted by D Lindy View Post
DEF usage will very as much as MPG of fuel usage, variables, Engine, size, speed, road conditions, mountain driving, weight being towed, etc. as to make it almost impossible to come up with and average consumption rate. For example in our coach equipped with a Cummins, 8.9L ISL motor highway speed 64MPH, I go thru about 2.5 - 3 gls. of DEF every 3000 miles, so I figure ruffly 1gl. per 1000 miles.
That's extremely good DEF consumption. My ISC gets no where near that. 2.5-3% at best.

Are you running a tuner?

2014 Fleetwood Discovery 40G -> 06 Rubicon LJ
Mechanical and Electrical Engineer
Team 065 and 0232 "De Opresso Liber"
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